1743392200
domain: N
Appears in sequences
- a(n) = (3^n - 1)/2.at n=20A003462
- a(n) = (-1)^n * (3^n - 1)/2.at n=20A076040
- Maximal term in Collatz-iteration started at 3^n-1.at n=18A087971
- Row sums in A112668.at n=19A110737
- a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,4,14,41.at n=19A132357
- a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,4,13,40.at n=19A133453
- a(0) = 1 and a(n) = (3^n - (-1)^n)/2 for n >= 1.at n=20A152011
- Numbers n such that 9^10 + n^2 is a square.at n=10A180973
- a(n) = (9^n - 1)/2.at n=10A191681
- The 3 X 3 X ... X 3 dots problem (3, n times): minimal number of straight lines (connected at their endpoints) required to pass through 3^n dots arranged in a 3 X 3 X ... X 3 grid.at n=20A261547
- Numbers k such that there is an anti-divisor d of k satisfying sigma(d) = k.at n=33A286917
- Least number m for which there exists some positive k < m where the sum of the integers from k + 1 to m inclusive is an n-th power > 1.at n=37A372782